50 words about flavor:
For centuries, Athambia's social structure has consisted of scholastics: informal fraternities (some secret, some open) dedicated to the study of a particular magical craft. Now, the Order of the Starred Cloak, a scholastic of enchanters, has been gradually infiltrated by a totalitarian cabal who seeks to brainwash & enslave Athambia’s students.

50 words about flavor tied to mechanics:
All the “spell type matters” cards are tied to a particular scholastic (there are four main scholastics in this set: artifact, enchantment, creature, and instant/sorcery.) The bad guys are easily identifiable: they’re the “enchantments matter” team. Teach and Level Up reinforce the feeling of a school where students grow.

Preparedness
1W
Sorcery
Target creature gets +2/+0 and first strike until end of turn.
Teach (As this spell resolves, you may exile it taught to a creature that has not been taught any spells. That creature has “T: You may cast a copy of a spell this creature has been taught by paying its mana cost. Play this ability only when you could cast a sorcery.”)

While there was a bit too much going on here mechanically, I quite liked each mechanic in a vacuum.

I also want to call out Evan's idea of secret societies. I think that's a really exciting theme and the best execution that keeps the schools/lessons idea of Harry Potter while integrating it into world-filling and seriousness-level-appropriate theme for Magic.

I tried typing in the Teach text into MSE, the text takes up the entire text box all by itself! This may be the place to use an alternate card frame like Curse of the Fire Penguin.

I'm not sure that cards like the Artificer is enough to communicate that the set theme of choose a specialty spell type, since every set has cards like Enchantresses or creatures that like Equipment, etc. I feel there should be a separate mechanic about choosing your spell type, although the Level up guys that trigger on a spell type help with that too.